This criterion basically cancels out your other criteria. It's true that you could get an EFI version of the GTX 570 from MVC on eBay, but most people buy it now for CUDA, not for gaming, since the GTX 6xx series has much better gaming performance and consumes less power. One alternative is to sell your 5770, get a used GT 120 for boot screen, then get a GTX 670/680 for best gaming performance. Or you could wait for Apple's next generation video cards with EFI.

One alternative is to sell your 5770, get a used GT 120 for boot screen, then get a GTX 670/680 for best gaming performance. Or you could wait for Apple's next generation video cards with EFI.

Just on this point: I've just read here that the Idle power draw of my 5770 is 18W, whilst the GTX 670 is between 100 and 120! Whilst when I'm gaming through Boot Camp this isn't going to be an issue, if I'm booting into the Mac and not gaming, this is really going to add to my electric bill (here in the UK that's a legitimate concern, as DanielCoffey will confirm). Is this low idle power an AMD-only feature?

Quote:

Originally Posted by DanielCoffey

There are some EFI flashed cards sold by Macvidcards that may suit your needs.

Oops, I meant to add that I don't mind if I have to perform the EFI flashing myself to make the card meet my criteria. All I care is that, after performing the flashing, the card remain stable and all of its features.

Oh, which reminds me, I read during my brief research on this topic today about how the flashing procedure makes graphics cards work with PCIe 2.0 on the Mac side, but only PCIe 1.0 on the Windows 7 side. Is that still the case? Is that likely to form an unacceptable bottleneck with a new GPU?

Just on this point: I've just read here that the Idle power draw of my 5770 is 18W, whilst the GTX 670 is between 100 and 120!

As 666sheep already pointed out, the 100 and 120 you cited were for total system idle power, the GTX 670 in general consumes less than 18W when idle because it's a much newer design than the 5770/5870 generation.